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Finding the Fourth Proportional to 138.75, 207.85 and 100.14

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Solution

The fourth proportional to 138.75, 207.85 and 100.14 is: 150.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.75 : 207.85 = 100.14 : x
  2. Step 2: Convert to fraction form
    138.75/207.85 = 100.14/x
  3. Step 3: Cross multiply
    138.75x = 207.85 × 100.14
  4. Step 4: Simplify right side
    138.75x = 20,814.10
  5. Step 5: Solve for x
    x = 20,814.10/138.75
  6. Step 6: Final answer
    x = 150.01

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.